<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/stark.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button @click="logout" type="info">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div @click="toggleCollapse" class="toggle-button">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409EFF"
            unique-opened
            :collapse="isCollapse"
            :collapse-transition="false"
            :router="true"
            :default-active="activePath">
          <!-- 一级菜单 -->
          <!-- 如果不动态绑定index值，则所有导航栏会一起打开或关闭-->
          <!-- index只接受字符串，所以后面加一个空字符串-->
          <el-submenu v-for="item in menuList" :index="item.id + ''" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item @click="saveNavState('/' + subItem.path)" :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id">
              <!-- 二级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  // 定义一个组件的私有数据
  data(){
    return {
      // 左侧菜单数据
      menuList:[],
      iconsObj:{
        '125':'iconfont icon-user',
        '103':'iconfont icon-tijikongjian',
        '101':'iconfont icon-shangpin',
        '102':'iconfont icon-danju',
        '145':'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath:''
    }
  },
  // 整个页面加载的时候就应该立即获取左侧菜单
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods:{
    logout(){
      // 先清除token
      window.sessionStorage.clear()
      // 再跳转
      this.$router.push('/login')
    },
    // 获取菜单
    async getMenuList(){
      // 解构赋值重命名
      const {data: res} = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}
.el-header{
  background-color: #373D41;
  display: flex;
  justify-content:space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div{
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
  .el-menu{
    border-right: none;
  }
}

.el-main{
  background-color: #EAEDF1;
}

.iconfont{
  margin-right: 10px;
}

.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: .2em;
  cursor: pointer;
}
</style>